BSV-24

BSV-24 radio altimeter interface unit

BSV-24 is an aircraft electronic unit used as a radio altimeter interface block in the SAU-V24-1 automatic flight control system. The unit is associated with Mi-24 and Mi-35 family helicopters equipped with the corresponding Soviet / Russian automatic control system architecture. In technical documentation, the unit may be described as an interface unit for the altimeter or radio altimeter. Its role is to process and coordinate altitude-related signals used by the automatic flight control system in the altitude hold mode.

Function of BSV-24 in altitude control

The main function of the BSV-24 unit is continuous generation and coordination of control signals according to the operating logic of the SAU system in the “HEIGHT” automatic mode. The unit works with altitude information received from the onboard low-altitude radio altimeter and prepares the corresponding signal for automatic control circuits. This allows the helicopter automation to maintain a selected true height above ground or water surface, depending on flight mode, radio altimeter data and system configuration.

Interface with RV-5 / A-037 radio altimeter

BSV-24 receives height-related input from the RV-5 / A-037 low-altitude radio altimeter. The source context describes the input as an analog electrical signal proportional to current true height, with additional reliability / validity information from the radio altimeter. The BSV-24 unit converts, scales and coordinates this signal for further use by the SAU-V24-1 system. This connection is important for automatic low-altitude flight, hover-related modes and height stabilization tasks where geometric altitude above the surface is required.

BSV-24 in the SAU-V24-1 system architecture

The BSV-24 block works together with other SAU-V24-1 components. The source context identifies BV-24 as the central computing block, PVM-24 and PVP-24 as flight mode control panels, and VUAP-1 as the unified helicopter autopilot. In this architecture, BSV-24 provides the processed radio-altimeter height signal to the control system. The output signal may be used by the BV-24 computer and VUAP-1 autopilot circuits for control of the helicopter pitch / collective pitch channel, depending on system logic and documentation.

Construction and installation of BSV-24

BSV-24 is described as a block-module type unit installed in the helicopter equipment compartment on a shock-mounted frame. The unit is connected to the automatic flight control system wiring through standard aviation plug connectors. According to the source context, the unit has natural cooling through housing perforation. During maintenance, it should be inspected together with connectors, wiring, mounting frame, radio altimeter signal lines, SAU control panels, the BV-24 computing block and the VUAP-1 autopilot interface circuits.

Identification and ordering of BSV-24

Before ordering BSV-24, the helicopter type, SAU-V24-1 configuration, required condition and documentation set should be confirmed. The unit may be required for automatic control system repair, height hold mode troubleshooting, replacement of a defective radio altimeter interface block or spare parts stock for Mi-24 / Mi-35 helicopter avionics. For correct supply, it is useful to confirm whether the request concerns the BSV-24 unit only, associated connectors, mounting hardware, test documentation or related SAU-V24-1 components.

Product Type: Radio altimeter interface unit / automatic flight control system electronic block
Designation: BSV-24
Russian Designation: БСВ-24
Alternative Product Names: Radio altimeter interface unit, altimeter interface unit, altitude signal interface block, electronic control unit
Function: Processing and coordination of radio-altimeter height signals for SAU-V24-1 automatic control system
Application / Where Used: SAU-V24-1 automatic flight control system
System / Installation Area: Helicopter automatic flight control system / height hold channel interface
Associated Aircraft: Mi-24 and Mi-35 family helicopters according to source context and documentation
Associated Radio Altimeter: RV-5 / A-037 low-altitude radio altimeter
Associated Control System: SAU-V24-1
Associated Computing Unit: BV-24
Associated Autopilot: VUAP-1 unified helicopter autopilot
Associated Control Panels: PVM-24 and PVP-24
Operating Mode Context: Automatic “HEIGHT” mode / true height stabilization
Input Signals: Analog true-height signal from RV-5 / A-037 radio altimeter; radio altimeter validity / reliability signal according to source context
Radio Altimeter Height Input Range: 0 to 500 m, according to source context
Radio Altimeter Voltage Gradient: 20 mV/m, according to source context
Output Signal: Scaled height deviation signal for BV-24 and VUAP-1 control circuits
Height Stabilization Range: 5 to 300 m, according to source context
Static Stabilization Accuracy: ±2 to ±5 m, depending on terrain and selected height according to source context
Power Supply: 27 V DC and 36 V AC, 400 Hz
DC Current Consumption: Not more than 1.5 A, according to source context
Construction: Block-module unit for installation on shock-mounted frame
Cooling: Natural cooling through housing perforation
Connector Interface: Standard aviation plug connector type ShR / 2RM according to source context
Weight Reference: Approximately 3.5–4.2 kg
Operating Temperature Range: −60 °C to +60 °C
Operating Environment: Helicopter vibration and maneuvering loads according to military aviation equipment requirements
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, SAU-V24-1 documentation, wiring diagrams, test records and maintenance documentation if available

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